Read the sentence and choose the correct answer. For many years he ... for an effective antiseptic, but it wasn't until 1928 that he discovered penicillin.

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Вопрос:

Read the sentence and choose the correct answer. For many years he ... for an effective antiseptic, but it wasn't until 1928 that he discovered penicillin.

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Правильный ответ: had been searching. Пояснение: В предложении описывается действие, которое длилось в течение определенного периода времени до другого события в прошлом (до 1928 года). Для выражения длительного действия, предшествующего другому действию в прошлом, используется время Past Perfect Continuous (had been + глагол с окончанием -ing). *Translation: Correct answer: had been searching. Explanation: The sentence describes an action that lasted for a certain period of time before another event in the past (before 1928). To express a continuous action that happened before another action in the past, we use the Past Perfect Continuous tense (had been + verb ending in -ing).*

Read the sentence and choose the correct answer. For many years he ... for an effective antiseptic, but it wasn't until 1928 that he discovered penicillin.

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